Greek symbols (like delta) in MathType formulas are much thinner when the
document is exported as pdf. Other symbols like the integral or the sum sign are
also affected. This does not happen when the document is printed as PDF via
Acrobat or PDFCreator. In open office it is displayed correctly. I can supply a
demo if neccessary.

I cannot reproduce it from scratch but...
The PDF file shows as symbol font: "Symbol"
When I export a sample formula to PDF (on Vista) with one of the problematic
characters, the PDF shows "Symbols" AND "OpenSymbol" and the character displays
correctly.
@HDU: missing OpenSymbol font on the system? Anything else?

I have the "OpenSymbol" font installed. It is not happening with open office
formulas or symbols. Only MathType objects are affected and the symbols are
thinner when they are exported as pdf.
It's a aspect ratio problem.
Try to export the attached open office document as pdf and tell me what you see.

With the special-char field being involved this problem has quite possibly the same root case as issue
103417. Please recheck when CWS vcl103 has been integrated and reopen if needed.
*** This issue has been marked as a duplicate of 103417 ***

The problem still exists in open office 3.1.1rc and is even worse. Now also some
characters are totalle missplaced.
Try to open the .odt document from demo.zip and export it to pdf -> the result
is unusable!

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